Add --generate-mesh-id-experimental flag to server bootstrap (#24)

This flag has been added to the client deployment but not the server
deployment. Adding it to server now.

We need this fix in order for the CSM Observability Test to properly
record the server side metrics.

---------

Co-authored-by: Sergii Tkachenko <sergiitk@google.com>

framework/test_app/runners/k8s/gamma_server_runner.py

@@ -116,6 +116,7 @@ def run(  # pylint: disable=arguments-differ
         bootstrap_version: Optional[str] = None,
         route_template: str = "gamma/route_http.yaml",
         enable_csm_observability: bool = False,
+        generate_mesh_id: bool = False,
     ) -> List[XdsTestServer]:
         if not maintenance_port:
             maintenance_port = self._get_default_maintenance_port(secure_mode)
@@ -208,6 +209,7 @@ def run(  # pylint: disable=arguments-differ
             termination_grace_period_seconds=self.termination_grace_period_seconds,
             pre_stop_hook=self.pre_stop_hook,
             enable_csm_observability=enable_csm_observability,
+            generate_mesh_id=generate_mesh_id,
         )
 
         servers = self._make_servers_for_deployment(

framework/xds_gamma_testcase.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 import datetime
 import logging
-from typing import Optional
+from typing import List, Optional
 
 from framework.infrastructure import k8s
 import framework.infrastructure.traffic_director_gamma as td_gamma
@@ -139,3 +139,11 @@ def startTestClient(
             wait_for_server_channel_ready_timeout=datetime.timedelta(minutes=9),
             **kwargs,
         )
+
+    def startTestServers(
+        self, replica_count=1, server_runner=None, **kwargs
+    ) -> List[XdsTestServer]:
+        kwargs.setdefault("generate_mesh_id", True)
+        return super().startTestServers(
+            replica_count=replica_count, server_runner=server_runner, **kwargs
+        )

kubernetes-manifests/server.deployment.yaml

@@ -84,6 +84,9 @@ spec:
             % else:
             - "--node-metadata=app=${namespace_name}-${deployment_name}"
             % endif
+            % if generate_mesh_id:
+            - "--generate-mesh-id-experimental"
+            % endif
           resources:
             limits:
               cpu: 100m